vfs

pub(open) trait FileSystem {
  async mkdir_p(Self, String) -> Unit raise VfsError
  async write_file(Self, String, Bytes) -> Unit raise VfsError
  async write_string(Self, String, String) -> Unit raise VfsError
  async remove_file(Self, String) -> Unit raise VfsError
  async remove_dir(Self, String) -> Unit raise VfsError
}

pub(open) trait Flushable {
  async flush(Self) -> Unit raise VfsError
  async sync(Self) -> Unit raise VfsError
  dirty(Self) -> Bool
}

pub(open) trait ReadableFileSystem {
  async read_file(Self, String) -> Bytes raise VfsError
  async readdir(Self, String) -> Array[String] raise VfsError
  async is_dir(Self, String) -> Bool
  async is_file(Self, String) -> Bool
}

pub(open) trait Snapshottable {
  async export_snapshot(Self) -> Snapshot
  async replace_snapshot(Self, Snapshot) -> Unit raise VfsError
}

pub suberror VfsError {
  VfsError(String)
}

pub struct Snapshot {
  dirs : Array[String]
  files : Array[SnapshotFile]
} derive(Eq, Show)

pub struct SnapshotFile {
  path : String
  data : Bytes
} derive(Eq, Show)

pub enum VfsEvent {
  Write(String)
  Remove(String)
  Mkdir(String)
} derive(Eq, Show)

fn snapshot(dirs : Array[String], files : Array[SnapshotFile]) -> Snapshot

fn snapshot_file(path : String, data : Bytes) -> SnapshotFile

fn vfs_error(msg : String) -> VfsError